The suspect had 16 guns, but what kind of guns are they and where did he get them?

Paddock wanted to buy ammunition in bulk that day, but the show was about to close, so they exchanged contact information, according to Haig. Officials said Paddock made a purchase at Haig's home on Sept. 19 of more than 600 rounds of tracer ammunition of various calibers.

Haig said Paddock went back to his car to retrieve gloves before handling the boxes of ammunition that he had just purchased in the weeks before the attack.

Here's what you need to know about Stephen Paddock, the man police say is responsible for the Las Vegas Strip massacre.

Haig did not have a license to manufacture or sell armor-piercing ammunition, according to authorities. Documents seized during an investigative search of Haig's home revealed more than 100 instances of Haig selling armor-piercing ammunition throughout the country.